Process for preparing triazolinethione derivatives

ABSTRACT

According to a novel process, triazolinethione derivatives of the formula                    
     in which 
     R 1  and R 2  are each as defined in the description can be prepared by reacting triazole derivatives of the formula                    
      with sulphur in the presence of an aprotic polar diluent at temperatures between 140° C. and 160° C., 
     where the amounts of the reaction components are chosen such that between 6 and 15 mol of sulphur are present per mole of triazole derivative of the formula (II), 
     and where air is passed over the reaction mixture during the reaction.

The present invention relates to a novel process for preparing triazolinethione derivatives which are known as active compounds having microbicidal, in particular fungicidal, properties.

It is already known that triazolinethione derivatives can be prepared by reacting the corresponding triazole derivatives successively with strong bases and sulphur, followed by hydrolysis (cf. WO-A 96-16 048). The yields in this process are good. However, it has the disadvantage that it requires reaction conditions which are difficult to maintain on an industrial scale. Thus, for example, the use of butyllithium as base is not only very expensive, but also requires extremely complicated safety measures.

Furthermore, it is known that triazoline thione derivatives are obtained when the corresponding triazole derivatives are directly reacted with sulphur at high temperatures (cf. WO-A 96-16 048). However, this method has the disadvantage that the desired products are obtained in only relatively low yields.

It has now been found that triazolinethione derivatives of the formula

in which

R¹ and R² are identical or different and each represents optionally substituted alkyl, optionally substituted alkenyl, optionally substituted cycloalkyl, optionally substituted aralkyl, optionally substituted aralkenyl, optionally substituted aroxyalkyl, optionally substituted aryl or optionally substituted heteroaryl,

can be prepared by reacting triazole derivatives of the formula

in which

R¹ and R² are each as defined above with sulphur in the presence of an aprotic polar diluent at temperatures between 140° C. and 160° C.,

where the amounts of the reaction components are chosen such that between 6 and 15 mol of sulphur are present per mole of triazole derivative of the formula (II),

and where air is passed over the reaction mixture during the reaction.

It is extremely surprising that triazolinethione derivatives of the formula (I) can be prepared by the process according to the invention in substantially higher yields or under considerably more simple conditions than by the prior-art methods.

The process according to the invention has a number of advantages. Thus, as already mentioned, it is possible to synthesize triazolinethione derivatives of the formula (I) in high yield. It is also favourable that the required starting materials and reaction components can be prepared in a simple manner and are available even in relatively large amounts. A further advantage finally consists in the fact that the individual reaction steps can be carried out and the reaction products can be isolated without any problems.

Using 2-(1-chloro-cyclopropyl)-1-(2-chloro-phenyl)-3-(1,2,4-trazol-1-yl)-propan-2-ol as starting material and reacting this with the ten-fold molar amount of sulphur powder in the presence of dimethylformamide at 150° C., the course of the process according to the invention can be illustrated by the scheme below.

The formula (II) provides a general definition of the triazole derivatives required as starting materials for carrying out the process according to the invention. Preference is given to using compounds of the formula (II) in which

R¹ represents straight-chain or branched alkyl having 1 to 6 carbon atoms, where these radicals may be mono- to tetrasubstituted by identical or different substituents from the group consisting of halogen, alkoxy having 1 to 4 carbon atoms, alkoximino having 1 to 4 carbon atoms in the alkoxy moiety and cycloalkyl having 3 to 7 carbon atoms,

or

represents straight-chain or branched alkenyl having 2 to 6 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkoxy having 1 to 4 carbon atoms and cycloalkyl having 3 to 7 carbon atoms,

or

represents cycloalkyl having 3 to 7 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, cyano and alkyl having 1 to 4 carbon atoms,

or

represents aralkyl having 6 to 10 carbon atoms in the aryl moiety and 1 to 4 carbon atoms in the straight-chain or branched alkyl moiety, where the aryl moiety may in each case be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 4 carbon atoms in the alkyl moiety, nitro and cyano,

or

represents aralkenyl having 6 or 10 carbon atoms in the aryl moiety and 2 to 4 carbon atoms in the alkenyl moiety, where the aryl moiety may in each case be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkythio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 4 carbon atoms in the alkyl moiety, nitro and cyano,

represents aroxyalkyl having 6 to 10 carbon atoms in the aryl moiety and 1 to 4 carbon atoms in the straight-chain or branched oxyalkyl moiety, where the aryl moiety may in each case be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 4 carbon atoms in the alkyl moiety, nitro and cyano,

or

represents aryl having 6 to 10 carbon atoms, where each of these radical may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 4 carbon atoms in the alkyl moiety, nitro and cyano,

or

represents an optionally benzo-fused five- or six-membered heteroaromatic radical having 1 to 3 heteroatoms, such as nitrogen, sulphur and/or oxygen, where each of these radical may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, hydroxyalkyl having 1 to 4 carbon atoms, hydroxyalkinyl having 3 to 8 carbon atoms, alkoxy having 1 or 2 carbon atoms, alkylthio having 1 or 2 carbon atoms, halogenoalkyl, halogenoalkoxy and halogenoalkylthio having in each case 1 or case 2 carbon atoms and 1 to 5 identical or different halogen atoms, such as fluorine or chlorine atoms, formyl, dialkoxymethyl having 1 or 2 carbon atoms in each alkoxy group, acyl having 2 to 4 carbon atoms, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 3 carbon atoms in the alkyl moiety, nitro and cyano, and

R² represents straight-chain or branched alkyl having 1 or 6 carbon atoms, where these radicals may be mono- to tetrasubstituted by identical or different substituents from the group consisting of halogen, alkoxy having 1 to 4 carbon atoms, alkoximino- having 1 to 4 carbon atoms in the alkoxy moiety and cycloalkyl having 3 to 7 carbon atoms,

or

represents straight-chain or branched alkenyl having 2 to 6 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkoxy having 1 to 4 carbon atoms and cycloalkyl having 3 to 7 carbon atoms,

or

represents cycloalkyl having 3 to 7 carbon atoms, where each of these radical may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, cyano and alkyl having 1 to 4 carbon atoms,

or

represents aralkyl having 6 to 10 carbon atoms in the aryl moiety and 1 to 4 carbon atoms in the straight-chain or branched alkyl moiety, where the aryl moiety may in each case be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 4 carbon atoms in the alkyl moiety, nitro and cyano,

or

represents aralkenyl having 6 to 10 carbon atoms in the aryl moiety and 2 to 4 carbon atoms in the alkenyl moiety, where the aryl moiety may in each case be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 or 4 carbon atoms in the alkyl moiety, nitro and cyano,

or

represents aroxyalkyl having 6 to 10 carbon atoms in the aryl moiety and 1 to 4 carbon atoms in the straight-chain or branched oxyalkyl moiety, where the aryl moiety may in each case be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 4 carbon atoms in the alkyl moiety, nitro and cyano,

or

represents aryl having 6 to 10 carbon atoms, wherein each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, alkylthio having 1 to 4 carbon atoms, halogenoalkyl having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkoxy having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, halogenoalkylthio having 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, cycloalkyl having 3 to 7 carbon atoms, phenyl, phenoxy, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 4 carbon atoms in the alkyl moiety, nitro and cyano,

or

represents an optionally benzo-fused five- or six-membered heteroaromatic radical having 1 to 3 heteroatoms, such as nitrogen, sulphur and/or oxygen, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of halogen, alkyl having 1 to 4 carbon atoms, hydroxyalkyl having 1 to 4 carbon atoms, hydroxyalkinyl having 3 to 8 carbon atoms, alkoxy having 1 or 2 carbon atoms, alkylthio having 1 or 2 carbon atoms, halogenoalkyl, halogenoalkoxy and halogenoalkylthio having in each case 1 or 2 carbon atoms and 1 to 5 identical or different halogen atoms, such as fluorine or chlorine atoms, formyl, dialkoxymethyl having 1 or 2 carbon atoms in each alkoxy group, acyl having 2 to 4 carbon atoms, alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy moiety, alkoximinoalkyl having 1 to 4 carbon atoms in the alkoxy moiety and 1 to 3 carbon atoms in the alkyl moiety, nitro and cyano.

Particular preference is given to using triazole derivatives of the formula (II) in which

R¹ represents straight-chain or branched alkyl having 1 to 4 carbon atoms, where these radicals may be mono- to tetrasubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, alkoximino having 1 or 2 carbon atoms in the alkoxy moiety, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents straight-chain or branched alkenyl having 2 to 5 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents cycloalkyl having 3 to 6 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, cyano, methyl, ethyl, propyl, isopropyl and tert-butyl,

or

represents phenylalkyl having 1 to 4 carbon atoms in the straight-chain or branched alkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenylalkenyl having 2 to 4 carbon atoms, in the alkenyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenoxyalkyl having 1 to 4 carbon atoms in the straight-chain or branched oxyalkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenyl which may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents pyrazolyl, imidazolyl, 1,2,4-triazolyl, pyrrolyl, furanyl, thienyl, thiazolyl, oxazolyl, pyridinyl, pyrimidinyl, triazinyl, quinolinyl, isoquinolinyl, quinazolinyl, indolyl, benzothienyl, benzofuranyl, benzothiazolyl or benzimidazolyl, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, chlorodifluoromethylthio, hydroxymethyl, hydroxyethyl, hydroxyalkinyl having 4 to 6 carbon atoms, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro, cyano, formyl, dimethyoxymethyl, acetyl and propionyl, and

R² represents straight-chain or branched alkyl having 1 to 4 carbon atoms, where these radicals may be mono- to tetrasubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, alkoximino having 1 to 2 carbon atoms in the alkoxy moiety, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents straight-chain or branched alkenyl having 2 to 5 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents cycloalkyl having 3 to 6 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, cyano, methyl, ethyl, propyl isopropyl and tert-butyl,

or

represents phenylalkyl having 1 to 4 carbon atoms in the straight-chain or branched alkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenylalkenyl having 2 to 4 carbon atoms in the alkenyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenoxyalkyl having 1 to 4 carbon atoms in the straight-chain or branched oxyalkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenyl which may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents pyrazolyl, imidazolyl, 1,2,4-triazolyl, pyrrolyl, furanyl, thienyl, thiazolyl, oxazolyl, pyridinyl, pyrimidinyl, triazinyl, quinolinyl, isoquinolinyl, quinazolinyl, indolyl, benzothienyl, benzofuranyl, benzothiazolyl or benzimidazolyl, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, chlorodifluoromethylthio, hydroxymethyl, hydroxyethyl, hydroxyalkinyl having 4 to 6 carbon atoms, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro, cyano, formyl, dimethoxymethyl, acetyl and propionyl.

Very particular preference is given to using triazole derivatives of the formula (II) in which

R¹ represents n-propyl, isopropyl, n-butyl, i-butyl, sec-butyl or tert-butyl, where these radicals may be mono- to tetrasubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, methoximino, ethoximino, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents straight-chain or branched alkenyl having 2 to 5 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents 1-methyl-cyclohexyl, cyclohexyl, 1-chloro-cyclopropyl, 1-fluorocyclopropyl, 1-methyl-cyclopropyl, 1-cyano-cyclopropyl, cyclopropyl, 1-methyl-cyclopentyl or 1-ethyl-cyclopentyl,

or

represents phenylalkyl having 1 or 2 carbon atoms in the straight-chain or branched alkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenylalkenyl having 2 to 4 carbon atoms in the alkenyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenoxyalkyl having 1 to 4 carbon atoms in the straight-chain or branched oxyalkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenyl which may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents pyrazolyl, imidazolyl, 1,2,4-triazolyl, pyrrolyl, furanyl, thienyl, thiazolyl, oxazolyl, pyridinyl, pyrimidinyl, triazinyl, quinolinyl, isoquinolinyl, quinazolinyl, indolyl, benzothienyl, benzofuranyl, benzothiazolyl or benzimidazolyl, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, chlorodifluoromethylthio, hydroxymethyl, hydroxyethyl, hydroxyalkinyl having 4 to 6 carbon atoms, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro, cyano, formyl, dimethoxymethyl, acetyl and propionyl, and

R² represents n-propyl, isopropyl, n-butyl, i-butyl, sec-butyl or tert-butyl, where these radicals may be mono- to tetrasubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, methoximino, ethoximino, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents straight-chain or branched alkenyl having 2 to 5 carbon atoms, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methoxy, ethoxy, propoxy, isopropoxy, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl,

or

represents 1-methyl-cyclohexyl, cyclohexyl, 1-chloro-cyclopropyl, 1-fluoro-cyclopropyl, 1-methyl-cyclopropyl, 1-cyano-cyclopropyl, cyclopropyl, 1-methyl-cyclopentyl or 1-ethyl-cyclopentyl,

or

represents phenylalkyl having 1 or 2 carbon atoms in the straight-chain or branched alkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenylalkenyl having 2 to 4 carbon atoms in the alkenyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenoxyalkyl having 1 to 4 carbon atoms in the straight-chain or branched oxyalkyl moiety, where the phenyl moiety may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents phenyl which may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, difluoromethoxy, chlorodifluoromethylthio, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro and cyano,

or

represents pyrazolyl, imidazolyl, 1,2,4-triazolyl, pyrrolyl, furanyl, thienyl, thiazolyl, oxazolyl, pyridinyl, pyrimidinyl, triazinyl, quinolinyl, isoquinolinyl, quinazolinyl, indolyl, benzothienyl, benzofuranyl, benzothiazolyl or benzimidazolyl, where each of these radicals may be mono- to trisubstituted by identical or different substituents from the group consisting of fluorine, chlorine, bromine, methyl, ethyl, tert-butyl, methoxy, ethoxy, methylthio, trifluoromethyl, trifluoromethoxy, trifluoromethylthio, chlorodifluoromethoxy, chlorodifluoromethylthio, hydroxymethyl, hydroxyethyl, hydroxyalkinyl having 4 to 6 carbon atoms, methoxycarbonyl, ethoxycarbonyl, methoximinomethyl, 1-methoximinoethyl, nitro, cyano, formyl, dimethoxymethyl, acetyl and propionyl.

The triazole derivatives of the formula (II) are known or can be prepared by known methods (cf. EP-A 0 015 756, EP-A 0 040 345, EP-A 0 052 424, EP-A 0 061 835, EP-A-0 297 345 and EP-A 0 470 463).

When carrying out the process according to the invention, sulphur is generally employed in the form of powder.

Suitable diluents for carrying out the process according to the invention are all customary aprotic polar organic solvents. Preference is given to using amides, such as dimethylformamide, furthermore N-alkyl-pyrrolidones, such as N-octyl-pyrrolidone and N-dodecyl-pyrrolidone, and also N-alkyl-caprolactams, such as N-methyl-caprolactam and N-octyl-caprolactam.

When carrying out the process according to the invention, the reaction temperatures can be varied within a certain range. In general, the reaction is carried out at temperatures between 140° C. and 160° C., preferably between 150° C. and 160° C.

The process according to the invention is generally carried out under atmospheric pressure. However, it is also possible to carry out the process under elevated pressure.

When carrying out the process according to the invention, generally from 6 to 15 mol, preferably from 8 to 13 mol, of sulphur are employed per mole of triazole derivative of the formula (II). During the reaction, a stream of air is passed over the reaction mixture. Work-up is carried out by customary methods. In general, the reaction mixture is filtered and then concentrated under reduced pressure, the residue that remains is taken up in an organic solvent which is sparingly water-miscible, and the organic phase is washed, dried and concentrated. The resulting product can be freed of any impurities that may be present by customary methods, for example by chromatography or recrystallization.

The triazolinethione derivatives preparable according to the invention can be present in the “thiono” form of the formula

or in the tautomeric “mercapto” form of the formula

For the sake of simplicity, only the “thiono” form is shown in each case.

The triazolinethione derivatives preparable according to the invention are known as active compounds having microbicidal, in particular fungicidal, properties (cf. WO-A 96-16 048).

The practice of the process according to the invention is illustrated by the examples below.

PREPARATION EXAMPLES Example 1

With stirring, a mixture of 50 g (0.16 mol) of 2-(1-chloro-cyclopropyl)-1-(2-chlorophenyl)-3-(1,2,4-triazol-1-yl)-propan-2-ol, 50 g (1.6 mol) of sulphur powder and 100 ml of dimethylformamide is heated at 150° C. for 16 hours. During this time, a continuous stream of air is passed over the reaction mixture. The reaction mixture is then cooled to room temperature and filtered. The filter residue is washed with 100 ml of dimethylformamide. The combined organic phases are concentrated under reduced pressure, and the residue that remains is extracted three times with in each case 100 ml of toluene which had been heated to 60° C. The combined organic phases are initially washed with 100 ml of 10% strength aqueous hydrochloric acid and then three times with in each case 100 ml of 10% strength aqueous sodium hydroxide solution. The combined aqueous alkaline phases are reextracted with toluene. The combined organic phases are dried over sodium sulphate and then concentrated under reduced pressure. This gives 6.8 g of a product which, according to HPLC analysis, comprises 83.5% of 2-(1-chloro-cyclopropyl)-1-(2-chloro-phenyl)-3-(1,2,4-triazol-1-yl)-propan-2-ol.

The aqueous alkaline phase is acidified by addition of 50 ml of concentrated hydrochloric acid and then extracted three times with in each case 100 ml of warm toluene. The combined organic phases are dried over sodium sulphate and then concentrated under reduced pressure to a volume of about 40 ml. After cooling and seeding, a yellow solid crystallizes out and is filtered off. This gives 41.2 g of a product which, according to HPLC analysis, comprises 91.4% of 2-(1-chloro-cyclopropyl)-1-(2-chloro-phenyl)-3-(4,5-dihydro-1,2,4-triazol-5-thiono-1-yl)-propan-2-ol. Accordingly, the calculated yield is 75% of theory.

COMPARATIVE EXAMPLES Example A

At −20° C., a mixture of 3.12 g (10 mmol) of 2-(1-chloro-cyclopropyl)-1-(2-chlorophenyl)-2-(1,2,4-triazol-1-yl)-propan-2-ol and 45 ml of absolute tetrahydrofuran is admixed with 8.4 ml (21 mmol) of n-butyl-lithium in hexane and stirred at 0° C. for 30 minutes. The reaction mixture is then cooled to −70° C., admixed with 0.32 g (10 mmol) of sulphur powder and stirred at −70° C. for 30 minutes. The mixture is warmed to −10° C., admixed with ice-water and adjusted to pH 5 by addition of dilute sulphuric acid. The mixture is extracted repeatedly with ethyl acetate, and the combined organic phases are dried over sodium sulphate and concentrated under reduced pressure. In this manner, 3.2 g of a product which, according to gas chromatographic analysis, comprises 95% of 2-(1-chloro-cyclopropyl)-1-(2-chloro-phenyl)-3-(4,5-dihydro-1,2,4-triazol-5-thiono-1-yl)-propan-2-ol are obtained. Recrystallization from toluene gives this substance as a solid which melts at from 138 to 139° C.

Example B

With stirring, a mixture of 3.12 g (10 mmol) of 2-(1-chloro-cyclopropyl)-1-(2-chloro-phenyl)-3-(1,2,4-triazol-1-yl)-propan-2-ol, 0.96 g (30 mmol) of sulphur powder and 20 ml of absolute N-methyl-pyrrolidone is heated at 200° C. for 44 hours. The reaction mixture is then concentrated under reduced pressure (0.2 mbar). The resulting crude product (3.1 g) is recrystallized from toluene. In this manner, 0.7 g (20% of theory) of 2-(1-chloro-cyclopropyl)-1-(2-chlorophenyl)-3-(4,5-dihydro-1,2,4-triazol-5-thiono-1-yl)-propan-2-ol is obtained in the form of a solid which melts at 138-139° C. 

What is claimed is:
 1. A process for preparing a triazolinethione derivative of the formula

in which R¹ and R² are identical or different and each represents optionally substituted alkyl, optionally substituted alkenyl, optionally substituted cycloalkyl, optionally substituted aralkyl, optionally substituted aralkenyl, optionally substituted aroxyalkyl, optionally substituted aryl or optionally substituted heteroaryl, comprising reacting a triazole derivative of the formula

in which R¹ and R² are each as defined above with sulphur in the presence of an aprotic polar diluent at temperatures between 140° C. and 160° C., where the amounts of the reaction components are chosen such that between 6 and 15 mol of sulphur are present per mole of triazole derivative of the formula (II), and where air is passed over the reaction mixture during the reaction.
 2. The process according to claim 1, characterized in that the aprotic polar diluent used is an amide, an N-alkyl-pyrrolidone or an N-alkyl-caprolactam.
 3. The process according to claim 1, characterized in that the reaction is carried out at temperatures between 150° C. and 160° C.
 4. The process according to claim 1, characterized in that the triazole derivative starting material used is 2-(1-chloro-cyclopropyl)-1-(2-chloro-phenyl)-3-(1,2,4-triazol-1-yl)-propan-2-ol of the formula 